Photographic objective



7 A a,-9 22.337 H 0% (Z E. GLATZEL PHOTOGRAPHIC OBJECTIVE Filed Nov. 6, 1958 SEARCH ROOM V V M/ 2,922,337 T 2 a 4 x 2 2 4 7 2 Sheets-Sheet 1 Jan. 26, 1960 E. GLATZEL PHOTOGRAPHIC OBJECTIVE 2 Sheets-Sheet 2 Filed Nov. 6, 1958 Patented Jan. 26, 1960 United States Patent "ic 2,922,331

. Table I (Fig. I) 2 922 [Back focal length so'=1.0689-f. Aperture ratio 1:4.1

PHOTOGRAPHIC OBJECTIVE Lenses Radii Axial m we An/r 5 Separations Erhard Glatzel, Heidenheim (Brenz), Germany, assignor to Carl Zeiss, Heidenheim (Brcnz), Wurttemberg, Ger- =-|-1 3434-f +0.459766/f many Ll----- d.=0.o5e4-] 1. 61765 55.10

n 0.4132- 4.3051510 Application November 6, 1958, Serial No. 772,385 1 5892f d1=0.6503-f 73983 0 Claims priority, application Germany November 12, 1957 n =-1 3531.f 2:22;; 1'48749 o4 +0.3e021ell 1= aims, 0.6221- 0.997 7 Cl (CL 88-57) L3"... f d =0.4285-f 1. 62041 60.29 364/, n ==1.0983-f d 0 +0.564898/f The invention concerns photographic objectives which L 1 -f d 0366 1 69968 34 95 /f consist of 5 members more particularly, in the direction =+0 5584.f 7- --1 252g64/f of the light, of a meniscus-shaped dispersive member with 7 0904 s= 'f +0 568985 its concave curvature turned towards the diaphragm, 62041 0, of a collective member in which the radii of the two -f external surfaces are numerically longer than 0.50xf, of a biconvex collective member in which the algebraic Table II (see Fig. 1)

sum of the individual surface refractive powers (An/r) lies within the limits of 1.00X1/f and 2.00 1/f, of a biconcave dispersive member, and of an asymmetrical Lenses Rad [Back focal length so'=1.0957'f. Aperture ratio 1:4.]

Axial n v M r collective member which turns its more deeply curved Separations d d surface towards the image.

The invention consists of a special modification of -f /f the said type of objective which is basically of prior art. r: =+0.473 L617 6510 4304270 It has been found by investigation that a good compromise -f between the individual aberrations can be attained if 5'75u'f d 1692.f g 70,04 o'O84765/f the third member is bent in such a way that its external 13443'f a 0 0028 f +0'362632U. surface turned towards the fourth member receives a r.=+o.e270- +0.9s0521 radius lying between the limits -3.00 f and -0.05 X f. 13H 6241 60-29 0 548511 Favourable possibilities for the correction with respect n 'f d =0.1128-f If to oblique bundles of rays are therein obtained by such L d 0367, 1 69968 95 1448560 objectives in which the overall length lies between the r,=+0.5710- f 1.225380/f limits 1.00Xf and 3.00Xf. 8=

For the correction of distortion it is an advantage to Lin.- n +1'0990'f do=0.1128-f 1. 62041 60.29 +0'564517U make the air space between the fourth and the fifth member smaller than the air space between the third and the 40 fourth member. Table 111 (Fig- The flattening of the field of image is facilitated if the [Back focal length s.,'=1.0es5 Aperture ratio 1:4.] axial thickness of the third member is made greater than -1 Xf but 1655 h n Xf Lenses Radil Axial m 7 v An/r In the following tables the design data for six objecselparamns tives according to the invention are given of which the objectives according to the Tables I, III, V and VI are L =+1-3431'f d 05647. 1 62041 60 29 represented schematically in section in the Figures 1 r =+0.4731'f l.311316/f to 4 of the appended illustrations. Therein there are n 58757: -0 074002// designated L a.=0.1e91- 1.48749 70.04

i r the radii L n d. =0.3945-f 1.02041 60.29 +0'997620/f BY d the axial separations Lm" n =-0.3758-f d =0O338f 2012 mm /f By n the refractive indices 1 (]9B().f +0.564772/f By 11 the Abbe numbers T 59134 179710. By An/r the refractive powers of the individual lens 1 dg=0.0366-f 1.69761 38.65

The objectives according to Tables II and IV correspond 2041 0,29 +0'569126U schematically to the representations in section according "Fro-6875f to Fig. 1 and Fig. 3 respectively.

3 Table IV (see Fig. 3)

[Back focal length d-LOIZOJ. Aperture ratio 1:4.)

sum of the individual surface refractive powers (An/r) lies within the limits of LOOXl/f and 2.00 x U), and in which the surface in the third member turned towards the fourth member has a radius '4 within the limits -3.00 f and 0.50 f wherein f signifies the focal length of the objective,

p of a biconcave dispersive member, and Lenses Radii Axial m u An/r of an asymmetrical collective member which turns its 5 more deeply curved surface towards the image. =+1 3497-f +0.454056/ in which the overall length of the objective is greater than n 50734 41 4 61405 515-12 210475 1.00 f but less than 3.00Xf, the air space between the fourth and the fifth member is smaller than the air space between the third and the fourth'member and the axial =01 1. 1 .20 =--1 5035.f 000 5 680 64 4.0343724 thickness of the third member 1s greater than 0.10 f

2 but less than 0.50Xf. 0.6250- 0.992688 141.-.-.. n f d; =0.4021-,r 1.62041 60.20 U 2. An ob ective according to claim 1 Wlilh 1ts des1gn o -f do =0O98H data coinciding with the values given in the appended r =--0.7063-f -1.005522/f table in so far that each individual surface refractive 093094 1020 35-50 power (An/r) lies within a range of i0.30 1/f and ra=+0.4687-f 1.515352]! a. =0.0as7. each axial separation hes w1th1n a range of i0.50 f on Law" do 303366, L 53358 60 either side of the value given in the table: L, mad-fig). 4. 8033 62041 60.29 [Back focal length u6'=1.0689-f. Aperture ratio 114.]

m f Lenses Radll Axial m 2.1 An/r Separations Table V (Fig. 3)

1.3434 7 0.450766 [Back focal length s 1.0700 f. Aperture ratiol 4] T" T! f (115M564; 161765 55.10 If n =+0.4732-f l.305l5l/f Lenses Radii Axial nu we An/r d4 =0.6503-f Separations r =6.5892-f -0.073983/f n =-1.353l-f +0.360276/f n =+1.3537-f +0.454209/f a. =0.0D28.f L d =0.0564-f 1.61484 51. 11 r. =-+0.6221-f +0.997364/f r:=+0.4804-f 1.279083/f L4.-- (in-0.42854 1.62041 60.20

a, =0.6458-f n -=-1.0983-f +0.564898/f n =+7.503 4J +0.068958/f a, =0.1128-f Ll"--- d;=0.1692-! 1.51742 52.16 T1=0.5915-f 1.182911/f n=-1.7042 +0.303613/f L4-.." d1=0.0366-f 1. 69968 34. 05

d4 =0.0028J n =+0.5584-f l.252964/f r =+0.6091-f +1.018635/f a. =-0.0378;f L3".-- (in-0.37654 1.62041 60.20 "T -1.00044 +0.568985/f n =-1.2687-f +0.48900l/f L|; a. =0.0987-f 1. 62041 60. 20

a. =0.00s7- 3 r =-0.6880-f +0.90l785/f r1 =--0.734a-f -0.067206 f L4--. d =0.0282-f 1.71020 36.50

r4 =+0.4501- -1.57780l/f Whercm n E +1305. M3104 +M13838/f r to r are the respective radu of the refractmg surfaces LB..." 66 =0.0367-f 1. 54041 50. 00 of the lenses L to L 40 d to d are the axial separations and thicknesses be- L.-. dict-0.0804 1.62041 6020 m=-0.6883-f +0.90143l/f tween the refractive surfaces of the lenses,

n is the refractive index of the several lens materials, and T bl VI (Fi 4) y is the corresponding dispersion ratio or Abbe number of the corresponding lens materials. 13 1:1 11 11 '-1.0506-. A tur ti 1:2.8. ac m em I per o l 3. An obyective according to claim 1 with 1ts design Lenses Radll Axial m u An/r data coinciding with the values given in the appended Parations table 1n so far that each individual surface refractive 58 power (An/r) lies within a range of :0.30 1/;f and 1.0883- 0.5226 Liam n I d1 @3559! 6883 mm If each aznal separation lies within a range of :.0.50 f on 1.13tl910/f either side of the value given m the table: n +0.97%, at: -0.6634-] 20013 [Back focal length s '=1.0957-f. Aperture ratio 114.] 17..---. a; -0.0559-f 1.60140 38.28

4 ==+3-0018J 4300347 Lenses Radll Axial m m A'n/r 4 f Separations r =+0.5a77-,r +1.153886/f Li..." a. =0.2123J 1.62041 60.20

8864. +0.329930/f +0.459458/f n 858M s 'f 780590 L1... 0 a. =0.0564-f 1.61765 55.10 1 3042 0 L4..." a1 -0.0226-f 1.66998 39.20 7 If r; =+0.4032-f /f r =5.76l1-f 0.084765/f LL... a, =0.1692-f 1. 40740 70.04 n =+3- 6 3-f +0.105884/f n =1.3443-] +0.362632/f L1"--- +0 3392, d -0.022a-j 1.57501 41.61 245527 a, ()023.f

n ==+0.6270-j +0.989521/f L din-0.12014 1.66830 57.49 L d 1 2041 5039 m== 5 -f 6 /f n =1.l3l1-f mi 6 +0.54851l/f 0 6002 f =0'm8'f 1 146560 I claim: L4"..- 7 a1 =0.0367-f 1.69968 64.05 1. A photograph1c ob ective consisting of 5 members 65 T0 =+0.5710-f d 0226 1.225380/f more particularly in the sense of the direction of light =+L099W 8 4.0564517 L =0.112 2041 0. 20 of a meniscus-shaped dispersive member w1th 1ts concave F4698 1 6 6 388292/f curvature turned towards the dia hra of a collective member in w c e re 1 o e two exwherem tcrnal surfaces are numerically longer than 050x 2, r to r are the respective radu of the refractmg surfaces of a biconvex collective member in which the algebraic of the lenses L to L d to d,, are the axial separations and thicknesses between the refractive surfaces of the lenses,

71., is the refractive index of the several lens materials,

and

11 is the corresponding dispersion ratio or Abbe number of the corresponding lens materials.

4. An objective according to claim 1 with its design data coinciding with the values given in the appended table in so far that each individual surface refractive power (An/r) lies within a range of -0.30 l/f and each axial separation lies within a range of $0.50 X f on either side of the value given in the table:

[Back focal length so=1.0685-f. Aperture ratio 1:4.]

Lenses Radii Axial 1r 114 An/r Separations r =+l.3431-f +0.461934/f L1.-- d1 =0.0564. f 1. 62041 60.29

d =0.6425-f n =6.5875-f 0.074002/j La... d =0.1691-/ 1. 48749 70.04

r4 =1.3528-f +0.360367/f d4 =0.0028-]' r =+0.6219-f +0.997620/f La".-- d =0.3945-f 1.62041 60. 29

re =-0.3758-f +0.000772/j L4 (in =0.0338-f 1. 62012 49. 81

d1 =0.1127-f Ta =0.5913-f 1.179710/f L5"--- d =0.0366-f 1. 69761 38. 65

n =+0.5583-f -1.249548/f d =0.0378-f m=+1.0901-f +0.569126/j Lq dw=0.0986-f 1. 62041 60. 29

r11= 0.6878-f +0.902008/ f wherein r to r are the respective radii of the refracting surfaces of the lenses L to L d; to d are the axial separations and thicknesses between the refractive surfaces of the lenses,

n is the refractive index of the several lens materials, and

v is the corresponding dispersion ratio or Abbe number of the corresponding lens materials.

5. An objective according to claim 1 with its design data coinciding with the values given in the appended table in so far that each individual surface refractive power (An/r) lies within a range of :0.30 1/f and each axial separation lies within a range of :0.50 X f on either side of the value given in the table:

[Back focal length sn=1.0720-f. Aperture ratio 124.]

Lenses Radii Axial m 11.1 A'n/r Separations T1 =+1.3497'f +0.454950/f L|- d =0.0562-f 1. 61405 55.12

r =+0.5073'f 1.210475/f d1 =0.7451-f rs w 0.000000 L2 (13 =0.1687-f 1. 51680 64. 20

d4 =0.0028-f r =+0.6250'f +0.992688/f L3... (is =0.4021-f 1. 62041 60. 29

To -1.3114-f +0.473090/f de =0.0984-f r1 0.7063'f 1.005522/f L4..." (11 =0.0309-f 1. 71020 36. 50

(i =0.0387-f To =+1.4400-f +0.370547/f L do =0.0366-f 1. 53358 51. 60

1' 0: +O.3430-f +0.252457/j Lt---.. di0=0.084-1-/ 1. 62041 60. 29

m 0.6863'f +0.904058/f wherein r to r are the respective radii of the refracting surfaces of the lenses L to L :1 to d are the axial separations and thicknesses between the refractive surfaces of the lenses,

li is the refractive index of the several lens materials, and

p is the corresponding dispersion ratio or Abbe number of the corresponding lens materials.

6. An objective according to claim 1 with its design data coinciding with the values given in the appended table in so far that each individual surface refractive power (An/r) lies within a range of :L-0.30 1/f and each axial separation lies within a range of -0.50 f on either side of the value given in the table:

[Back focal length a =1.0700-f. Aperture ratio 1:4,]

Lenses Radii Axial m M An/r Separations n =+1.3537-f +0.454209 L1..." d1 =0.0564-f 1.61484 51.11 If m =+0.4804-f -1.279983/j dz =0.6458-f r3 =+7.5034-f +0.068958/f L2"--. d3 =0.1692-f 1. 51742 52. 16

n =1.7042-f +0.303613/f d4 =0.0028-f r5 =+0.6091-f +1.018635/f La.-- d =0.3765-f 1. 62041 60.29

m =1.2687-f +0.489001/j d =0.0987-f r -0.7343-f 0.9672 00/j Ll-.- d =0.0282-f 1.71020 36. 50

T3 =+0.4501-f -1.577801/f ds =0.0a10- ro =+1.3059-f +0.413838/j L5..-" do =0.0367-f 1. 54041 50. 89

m- +0.3256-f +0.245693/f Lt..." d1o=0.0804-f 1. 62041 60. 29

m= 0.6883-f +0.901431/f wherein r to r are the respective radii of the refracting surfaces of the lenses L to L d to d are the axial separations and thicknesses between the refractive surfaces of the lenses,

n is the refractive index of the several lens materials, and

i is the corresponding dispersion ratio or Abbe number of the corresponding lens materials.

7. An objective according to claim 1 with its design data coinciding with the values given in the appended table in so far that each individual surface refractive power (An/r) lies within a range of i0.30 1/f and each axial separation lies within a range of :0.50 f on either side of the value given in the table:

[Back focal length .9 =1.0596-f. Aperture ratio 122.8.1

r to r are the respective radii of the refracting surfaces of the lenses L to L d to d are the axial separations and thicknesses between the refractive surfaces of the lenses,

n is the refractive index of the several lens materials, and

v is the corresponding dispersion ratio or Abbe number of the corresponding lens materials.

References Cited in the file of this patent UNITED STATES PATENTS 1,934,561 Rayton Nov. 7, 1933 2,317,790 Mellor Apr. '27, 1943 2,649,022 Angenieux Aug. 18, 1953 2,826,115 Lange Mar. 11, 1958 2,844,997 Lange July 29, 1958 FOREIGN PATENTS 605,884 France Feb. 26, 1926 1,017,382 Germany Oct. 10, 1957 

